Quarterly report pursuant to Section 13 or 15(d)

Mack-Cali Realty Corporation Stockholders' Equity (Preferred Stock, Share Repurchase Program, And Dividend Reinvestment And Stock Purchase Plan) (Narrative) (Details)

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Mack-Cali Realty Corporation Stockholders' Equity (Preferred Stock, Share Repurchase Program, And Dividend Reinvestment And Stock Purchase Plan) (Narrative) (Details) (USD $)
 0 Months Ended 3 Months Ended
Oct. 27, 2011
Oct. 28, 2011
Mar. 31, 2012
Stock Option Activity [Line Items]      
Preferred stock, shares outstanding 10,000    
Preferred stock, percentage 8.00%    
Amount of depositary shares converted from the preferred shares 1,000,000    
Depositary shares value, per share $ 25    
Preferred stock, redemption price per share   $ 2,500  
Write off of preferred stock issuance costs   $ 164,000  
Maximum percentage of outstanding share owned by REIT     50.00%
Repurchase Of Equity [Member]
      
Stock Option Activity [Line Items]      
Capacity of share repurchase program     150,000,000
Date share repurchase program was initiated     September 12, 2007
Stock repurchased and retired shares     2,893,630
Aggregate cost of stocks repurchased     104,000,000
Capacity available for additional repurchase of outstanding common stock     46,000,000
Dividend Reinvestment And Stock Purchase Plan [Member]
      
Stock Option Activity [Line Items]      
Common stock reserved for future issuance     5,500,000
Monthly cash investment without restriction, maximum     5,000